**Core Concept**
Reoviruses are a family of viruses characterized by double-stranded RNA (dsRNA) genomes. This unique feature distinguishes them from other viral families, which typically have single-stranded RNA or DNA genomes.

**Why the Correct Answer is Right**
Reoviruses, including the Reo virus, possess a double-stranded RNA genome that is essential for their replication and transcription. The dsRNA genome is transcribed into messenger RNA, which is then translated into proteins necessary for viral replication and assembly. The Reo virus, a member of the Reoviridae family, is a prime example of a virus with a dsRNA genome.

**Why Each Wrong Option is Incorrect**
**Option A:** Hepatitis A virus (HAV) is a positive-sense single-stranded RNA (ssRNA) virus belonging to the Picornaviridae family. Its genome is not double-stranded RNA.
**Option B:** Hepatitis E virus (HEV) is also a positive-sense ssRNA virus, but it belongs to the Hepeviridae family. Its genome is not double-stranded RNA.
**Option D:** Coronaviruses are a family of positive-sense ssRNA viruses that belong to the Coronaviridae family. Their genomes are not double-stranded RNA.

**Clinical Pearl / High-Yield Fact**
Reoviruses are typically transmitted through the fecal-oral route and can cause a range of diseases, including gastroenteritis and respiratory infections. The Reo virus is notable for its ability to cause aseptic meningitis, particularly in children.

**✓ Correct Answer: C. Reo virus**